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HD 153417


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CA II H and K measurements made at Mount Wilson Observatory, 1966-1983
Summaries are presented of the photoelectric measurements of stellar CaII H and K line intensity made at Mount Wilson Observatory during theyears 1966-1983. These results are derived from 65,263 individualobservations of 1296 stars. For each star, for each observing season,the maximum, minimum, mean, and variation of the instrumental H and Kindex 'S' are given, as well as a measurement of the accuracy ofobservation. A total of 3110 seasonal summaries are reported. Factorswhich affect the ability to detect stellar activity variations andaccurately measure their amplitudes, such as the accuracy of the H and Kmeasurements and scattered light contamination, are discussed. Relationsare given which facilitate intercomparison of 'S' values with residualintensities derived from ordinary spectrophotometry, and for convertingmeasurements to absolute fluxes.

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Observation and Astrometry data

Constellation:Ophiucus
Right ascension:17h00m08.07s
Declination:-16°38'42.3"
Apparent magnitude:8.458
Distance:408.163 parsecs
Proper motion RA:-9.1
Proper motion Dec:-2.7
B-T magnitude:10.437
V-T magnitude:8.622

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 153417
TYCHO-2 2000TYC 6219-395-1
USNO-A2.0USNO-A2 0675-17359214
HIPHIP 83192

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